Light mod Denon 3910.. - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th June 2007, 12:23 AM   #1
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Default Light mod Denon 3910..

I have to change the laser on my 3910,while the hood is off I might at well install the XO3 that I have laying around.And change some regulators to the LM317/337 type.But firts some questions,the supply to the XO3,I could take it from the +12v line,but the sonic result will be better with a separate trafo and rectifier,or?
I se that the opams in the analog output runs on + - 9v,those regulators can be upgraded.
Then I assume the digital part runns on +5V,but there are 2 different 5v supplys(Green on the schema,+ - 9v, red)which one of the 5v regulators to uppgrade,or both?

Click the image to open in full size.

XO3 clock in on XTI,remove C112,C118 and R127,right?

Click the image to open in full size.
__________________
Regards ke
  Reply With Quote
Old 16th June 2007, 10:22 PM   #2
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Anyone tried this:
it even got better ripple rejection than TL317!TL780-05
__________________
Regards ke
  Reply With Quote
Old 16th June 2007, 10:54 PM   #3
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Ryssen,
I think you should look at the HF performance of the regulators. Bypassing the electrolytic caps might make a far better improvement than the basic regulator. This means leaving the regulators stock and bypassing may be better all around. Just don't get silly with the caps. Small box polyesters will be just fine.

I haven't looked at the regulator specs, but IC regulators generally have trouble at the higher frequencies.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 17th June 2007, 04:24 PM   #4
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Yes,the ripple current is messaured at 120hz..And the only one of 7805,780-05 and LT317 that has a diagram of the ripple at different frekvensys is LT317,and it shows that the ripple rejection is down about 20dB at 20Khz compared to 120hz..Then I wonder how bad the 7805 that is the one in the player.
I have some PCBs for a discrete regulator,maybe use them?
And I`am going to e-mail texas instruments for some more data on the
LM780-05.
Yes,I am going to bypass the electrolytic caps,thats my favorit.
__________________
Regards ke
  Reply With Quote
Old 17th June 2007, 05:08 PM   #5
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Ryssen,
I don't know what the high frequency behavior is on these. Adding a choke and cap after these might be a good idea, and before. That reduces the importance of regulator performance at higher frequencies.

Quote:
I have some PCBs for a discrete regulator,maybe use them?
Possibly. There is a chance the performance might be worse than what is in there. Depends. As long as you don't cause damage to the PCB, go ahead and try them. Should be interesting to see what your results are. If you can, try to look at the supplies before and after.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 18th June 2007, 03:20 PM   #6
Hartono is offline Hartono  Indonesia
diyAudio Member
 
Join Date: Nov 2002
Location: currently in China
put snubber on the power supply diode, or better change to fast "soft"recovery type. impotant to notice the "soft" when you decided to buy one.

Hartono
  Reply With Quote
Old 18th June 2007, 07:31 PM   #7
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Quote:
Adding a choke and cap after these might be a good idea, and before.
At least there is a C-L-C filter before all regulators.What value on the choke should i use after?The one before is 4,7uH.

Quote:
put snubber on the power supply diode, or better change to fast "soft"recovery type
Iwill do that.Thanks.
The e-lyts looks to be the cheapest type(non ESR)If I change them for
ESR types will it affect the PSU negaive in any way?(Switching PSU)
And just to be sure,if anyone is familiar with the schema,is it, "+5v_NSW" that is for the digital part?
The one marked +5v is probably for the rest,motors and stuff,I think.


The LM2940
seems pretty good on ripplerejektion,havent gotten any answer from texas yet.
__________________
Regards ke
  Reply With Quote
Old 18th June 2007, 07:43 PM   #8
Hartono is offline Hartono  Indonesia
diyAudio Member
 
Join Date: Nov 2002
Location: currently in China
"The e-lyts looks to be the cheapest type(non ESR)"

I guess you mean High ESR


"If I change them for
ESR types will it affect the PSU negaive in any way?(Switching PSU)"


and you would change the with low ESR types.

sometimes this can cause oscillation (bad) in switching PSU

Edit : if you want to change it, change the one after the choke, larger value is ok



Hartono
  Reply With Quote
Old 18th June 2007, 07:47 PM   #9
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Yes i meant high ESR,sorry..
Ok,so only them after then.
__________________
Regards ke
  Reply With Quote
Old 18th June 2007, 09:17 PM   #10
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Ryssen, Hartono,
Often, I have found the regular diodes to be the best. Don't always rush to replace them.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Denon 3910 Schematic needed Random Task Digital Source 42 14th May 2014 12:57 PM
Denon DVD-3910 Opamp help astark Digital Source 1 7th April 2013 02:34 PM
Comments on DENON DVD-3910 Ryssen Digital Source 2 28th January 2011 02:38 PM
mods for the Denon DVD-3910 cowanrg Digital Source 6 1st December 2006 07:36 PM
Denon DVD-2900 vs 3910, and mod. F.L. Digital Source 1 3rd November 2004 07:52 PM


New To Site? Need Help?

All times are GMT. The time now is 08:42 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2